Visualize geometry

In vdb_view

vdb_view is a third-party software, which can be found in the libopenvdb-tools package. You can search for detailed usage online. vdb_view is a command line utility

> vdb_view geometry.vdb

The grid is shown at the start

../_images/vdb_view1.png

To see geometry press ‘1’ (toggle tree topology view off) and ‘2’ (toggle surface view on) keys on your keyboard.

../_images/vdb_view2.png

Navigate with mouse

In Blender

Download Blender (free software) from the official website.

Version 3.1 and above can be used.

Open Blender graphical interface.

Click Add ‣ Volume ‣ Import OpenVDB, select the geometry.vdb file.

../_images/blender1.png

Select the initial cube with left mouse click.

On the panel on the bottom right, select Modifiers tab. Click Add Modifier ‣ Generate ‣ Volume to Mesh

../_images/blender2.png

In the Modifier settings, fill in

  • Object : geometry

  • Grid Name : FillingFrac

  • Threshold : 0.5

This will plot the isosurface where FillingFrac\(=0.5\).

The FillingFrac grid is filled with scalar values of \(\varphi\), that is, filling fraction. \(\varphi=1\) in the mesh cells filled with solid or liquid, and \(\varphi=0\) in the empty cells. Some cells are partially filled. The isosurface where \(\varphi=0.5\) is a good approximation of the metal surface.

../_images/blender3.png

Navigate Viewport with [Numpad .], Middle Mouse, Middle Mouse + Shift, Middle Mouse + Ctrl.

../_images/blender4.png